JP2008231591A - Method for producing coated paper, and coated paper - Google Patents
Method for producing coated paper, and coated paper Download PDFInfo
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- JP2008231591A JP2008231591A JP2007069275A JP2007069275A JP2008231591A JP 2008231591 A JP2008231591 A JP 2008231591A JP 2007069275 A JP2007069275 A JP 2007069275A JP 2007069275 A JP2007069275 A JP 2007069275A JP 2008231591 A JP2008231591 A JP 2008231591A
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本発明は、プレスパートに、脱水がフェルト−ベルトで構成されてなる少なくとも１基のシュープレスを持つ原紙抄紙部と、フィルムサイザーと、塗被部、ソフトカレンダーを通して塗被紙を仕上げる仕上げ部とが、一体となった１２００ｍ／分以上の塗被紙製造設備を用いる塗被紙の製造方法において、塗被紙表面の外観を良好にし、塗被紙の表裏差を少なくする技術に関するものである。 The present invention comprises a press part having a base paper making part having at least one shoe press formed by felt-belt dehydration, a film sizer, a coating part, and a finishing part for finishing the coated paper through a soft calendar. However, the present invention relates to a technique for improving the appearance of the coated paper surface and reducing the difference between the front and the back of the coated paper in a coated paper manufacturing method using a coated paper manufacturing facility of 1200 m / min or more. .
近年印刷用紙は、チラシ、カタログ、広告、宣伝を目的とした商業印刷分野で需要が増加している。製紙メーカーにとっては、安価で安定的に需要に答えるべく、高品質を維持したまま生産性を上げることが急務となっている。 In recent years, demand for printing paper has been increasing in the field of commercial printing for the purpose of flyers, catalogs, advertisements and promotions. For paper manufacturers, there is an urgent need to increase productivity while maintaining high quality in order to meet demand stably and inexpensively.
高品質を維持したまま生産性を上げるためには、高速抄紙機で原紙を抄造し、ついで塗工機で原紙に塗被し、その後、平滑化・光沢付けの高温ソフトカレンダー仕上げ処理を一体化させることが適している。 In order to increase productivity while maintaining high quality, paper is made with a high-speed paper machine, then coated on the paper with a coating machine, and then smoothing and glossing high-temperature soft calender finishing is integrated. Is suitable.
特に高速で抄紙する場合には、湿紙乾燥前の水分を出来るだけ低くするために、シュープレスを２基用いるタンデムシュープレスが多用されている。タンデムシュープレスは、湿紙からの脱水を、１基目のフェルト−フェルトと２基目のフェルト−ベルトとを組み合わせた脱水機構とすることで、最終製品の幅方向の水分プロファイルを良好にするのに適している。 In particular, when making paper at high speed, a tandem shoe press using two shoe presses is frequently used in order to reduce the moisture before drying the wet paper as much as possible. The tandem shoe press uses a dewatering mechanism that combines the first felt-felt and the second felt-belt for dewatering from the wet paper, thereby improving the moisture profile in the width direction of the final product. Suitable for
しかしながら、通常、オントップフォーマー、ギャップフォーマー等で作られた原紙を、フェルト−ベルトの組み合わせを少なくとも１基有するタンデムシュープレスで脱水した場合、フェルト面に当たった原紙とベルト面に当たった原紙とでは、平滑度、液体の吸収性が異なる。これを緩和するため、表裏で塗被量差をつけることが行われているが、解消には不十分である。 However, normally, when a base paper made of an on-top former, a gap former, etc. is dehydrated with a tandem shoe press having at least one felt-belt combination, the base paper hits the felt surface and the belt surface. Smoothness and liquid absorbency differ from the base paper. In order to alleviate this, a difference in coating amount has been made on the front and back sides, but this is insufficient for elimination.
一方、ソフトカレンダー処理する際に表裏差なく仕上げる方法が提案されている（例えば特許文献１を参照。）。これは、ソフトカレンダーで仕上げ処理する場合に、最初の４ニップの金属ロール面に当たる塗被紙の面がワイヤー側、フェルト側、フェルト側、ワイヤー側の順となる様に通紙することで、塗被紙の表裏差を少なくするものである。 On the other hand, a method has been proposed in which a soft calendering process is performed with no difference between the front and the back (for example, see Patent Document 1). This is because, when finishing with a soft calender, the coated paper surface that hits the first 4-nip metal roll surface is passed in the order of wire side, felt side, felt side, wire side, The difference between the front and back of the coated paper is reduced.
この方法によれば、オントップフォーマーを含む長網抄紙機と通常のプレスを備えた設備では、表裏差はある程度解消できる。しかし、オントップフォーマーでフェルト−ベルトの組み合わせを少なくとも１基有するシュープレスや、特にギャップフォーマーでフェルト−ベルトの組み合わせを少なくとも１基有するシュープレスの場合には、ワイヤー、フェルトの区別よりもフェルト−ベルトによる差異が大きく、表裏差の改善には至らない。 According to this method, the difference between the front and the back can be eliminated to some extent in a facility equipped with a long paper machine including an on-top former and a normal press. However, in the case of a shoe press that has at least one felt-belt combination in an on-top former, and in particular, a shoe press that has at least one felt-belt combination in a gap former, rather than the distinction between wires and felts. The difference due to the felt-belt is large, and the difference between the front and back is not improved.
これは、従来のオントップフォーマーとプレスの場合では、塗被紙の面がワイヤー面側のときに該表面の平滑度が粗く、液体吸収性も大きいが、これに対して、ギャップフォーマーでフェルト−ベルトの組み合わせを少なくとも１基有するシュープレスの場合には、塗被紙の面がベルト面側のときに該表面の平滑度が滑らかであるが、液体吸収性は多い性質となるためと考えられる。 This is because, in the case of the conventional on-top former and press, when the coated paper surface is on the wire surface side, the smoothness of the surface is rough and the liquid absorbency is large. In the case of a shoe press having at least one felt-belt combination, the smoothness of the surface is smooth when the coated paper surface is on the belt surface side, but the liquid absorbency is high. it is conceivable that.
フィルムサイザーは、１０００ｍ／分を超える高速でのサイズ液処理、顔料塗被に適した設備である。このフィルムサイザーを導入して、塗被前の原紙に澱粉を塗布し、原紙の表面強度改善及び内部結合強度の向上によって、印刷時の耐刷力を付与し、オフセット輪転印刷（以下、「オフ輪印刷」という。）での耐ブリスター性を改善させることが知られている。 The film sizer is a facility suitable for sizing liquid treatment and pigment coating at a high speed exceeding 1000 m / min. By introducing this film sizer, starch is applied to the base paper before coating, printing strength is increased by improving the surface strength and internal bond strength of the base paper, and offset rotary printing (hereinafter referred to as “OFF”). It is known to improve the blister resistance in “rotary printing”.
例えば、フィルムメタリングサイズプレスで澱粉液濃度２〜１２％を塗布する方法がある（例えば特許文献２を参照。）。
しかし、原紙が低坪量でサイズ剤を用いない場合若しくは微量しか用いない場合、水の浸み込みによる原紙の伸び、及びその後の乾燥による縮みが発生し、塗被及びソフトカレンダー処理をしても、ヒジワ又はコックリングと呼ばれる概観上の波打ちが発生する場合がある。したがって、特許文献１又は２などの従来技術では、塗被紙の表裏差及び外観上の波打ちを改善することはできなかった。なお、ヒジワとは、オフ輪印刷で両面に高濃度の絵柄を印刷した場合、用紙の流れ方向に沿って発生するシワのことをいう。 However, if the base paper has a low basis weight and no sizing agent is used or if only a small amount is used, the base paper will stretch due to water soaking and shrinkage due to subsequent drying. In some cases, an undulating appearance called hijiwa or cockling may occur. Therefore, the conventional techniques such as Patent Document 1 or 2 cannot improve the difference between the front and back surfaces of coated paper and the appearance of undulations. Note that wrinkles refer to wrinkles that occur along the paper flow direction when high-density images are printed on both sides by off-ring printing.
そこで本発明は、プレスパートに、脱水がフェルト−ベルトで構成されてなる少なくとも１基のシュープレスを持つ原紙抄紙部と、フィルムサイザーと、塗被部と、金属ロールと弾性ロールで組み合わされた一対のニップを持つソフトカレンダーが４基又は５基を通して塗被紙を処理する仕上げ部と、が一体となった抄造速度１２００ｍ／分以上の塗被紙製造設備を用いる塗被紙の製造方法において、塗被紙の表裏差を少なくし、ヒジワ又はコックリングと呼ばれる外観上の波打ちを防ぐことを目的とする。 Therefore, the present invention combines the press part with a base paper making part having at least one shoe press composed of a felt-belt, a film sizer, a coating part, a metal roll and an elastic roll. In a coated paper manufacturing method using a coated paper manufacturing facility having a paper making speed of 1200 m / min or more, in which a finishing part in which a soft calender having a pair of nips processes four or five coated papers is integrated. The object of the present invention is to reduce the difference between the front and back sides of coated paper and to prevent the appearance of wavy or cockling.
本発明は、前記に鑑み鋭意研究した結果、ソフトカレンダーを通す際の、最初の４ニップの金属ロール面に当たる塗被紙の面の通紙の仕方が、塗被紙の表裏差を少なくし、ヒジワ又はコックリングと呼ばれる外観上の波打ちを防ぐことに効果があることを見出し、本発明を完成させた。すなわち、本発明に係る塗被紙の製造方法は、プレスパートに、脱水がフェルト−ベルトで構成されてなる少なくとも１基のシュープレスを持つ原紙抄紙部と、フィルムサイザーと、塗被部と、金属ロールと弾性ロールで組み合わされた一対のニップを持つソフトカレンダーが４基又は５基を通して塗被紙を処理する仕上げ部と、が一体となった１２００ｍ／分以上の塗被紙製造設備を用いる塗被紙の製造方法において、前記ソフトカレンダーを通す際に、最初の４ニップの金属ロール面に当たる塗被紙の面が、前記シュープレスのフェルト側に接した原紙面に塗被した面であるフェルト側塗被面側、シュープレスのベルト側に接した原紙面に塗被した面であるベルト側塗被面側、ベルト側塗被面側、フェルト側塗被面側の順になるように通紙することを特徴とする。 As a result of diligent research in view of the above, the present invention has a method of passing the surface of the coated paper that hits the metal roll surface of the first 4 nips when passing through the soft calendar, reducing the difference between the front and back of the coated paper The present invention has been completed by finding that it is effective in preventing the appearance of undulations called Hijiwa or cockling. That is, in the method for producing a coated paper according to the present invention, a press part includes a base paper making unit having at least one shoe press formed by a felt-belt dewatering, a film sizer, a coating unit, Using a coated paper manufacturing facility of 1200 m / min or more in which a soft calender having a pair of nips combined with a metal roll and an elastic roll processes a coated paper through four or five sets, is integrated. In the coated paper manufacturing method, when passing through the soft calender, the surface of the coated paper that hits the metal roll surface of the first 4 nips is the surface coated on the base paper surface that is in contact with the felt side of the shoe press. The felt side coating surface side, the belt side coating surface side that is the surface coated on the base paper surface in contact with the belt side of the shoe press, the belt side coating surface side, and the felt side coating surface side are passed in this order. Characterized in that it.
本発明に係る塗被紙の製造方法では、前記フィルムサイザーにおいて、接着剤を主成分とする固形分濃度が１３〜１８質量％の水性液が塗布されることが好ましい。高濃度の水溶液を使用して原紙への水の持ち込みを抑え、かつ、原紙への水分移行を少なくすることによって、原紙の伸び若しくは縮みを抑制し、ヒジワ又はコックリングをより抑制することができる。 In the method for producing a coated paper according to the present invention, it is preferable that an aqueous liquid having a solid content concentration of 13 to 18% by mass containing an adhesive as a main component is applied to the film sizer. By using a high-concentration aqueous solution to suppress the introduction of water to the base paper and to reduce the moisture transfer to the base paper, it is possible to suppress the expansion or shrinkage of the base paper and to further suppress creases or cockling. .
本発明に係る塗被紙は、本発明に係る塗被紙の製造方法によって製造されたことを特徴とする。 The coated paper according to the present invention is manufactured by the coated paper manufacturing method according to the present invention.
本発明によって、プレスパートに、脱水がフェルト−ベルトで構成されてなる少なくとも１基のシュープレスを持つ原紙抄紙部と、フィルムサイザーと、塗被部と、金属ロールと弾性ロールで組み合わされた一対のニップを持つソフトカレンダーが４基又は５基を通して塗被紙を処理する仕上げ部と、が一体となった１２００ｍ／分以上の塗被紙製造設備を用いる塗被紙の製造方法において、塗被紙の表裏差を少なくし、ヒジワ又はコックリングと呼ばれる外観上の波打ちを防ぐことができる。 According to the present invention, the press part has a base paper making part having at least one shoe press made of felt-belt, a film sizer, a coated part, a pair of metal rolls and elastic rolls. In a coated paper manufacturing method using a coated paper manufacturing facility of 1200 m / min or more in which a soft calender having a nip of 4 and 5 finishes and a finishing section for processing coated paper through one unit are combined. The difference between the front and back sides of the paper can be reduced, and the appearance of undulations called elbow or cockling can be prevented.
［作用］
まず、本発明の作用について説明する。ソフトカレンダー処理では、塗被紙の平滑度向上・光沢発現のために１００℃〜２００℃の高温となるが、ニップを通過する毎に塗被紙の水分が失われていく。塗被紙の水分が最も高い１ニップ目に、金属ロール面に当たった塗被紙の面は、表面が可塑化しやすく、最も白紙光沢、平滑性が出やすくなる。したがって、脱水がフェルト−ベルトで構成されてなる少なくとも１基のシュープレスを持つ場合には、塗被量差をつけて表裏差を少なくしているといえども、平滑が劣る、シュープレスのフェルト側に接した原紙面に塗被した面（以下、「フェルト側塗被面又はＦ」という。）を金属ロールに当てる必要がある。
[Action]
First, the operation of the present invention will be described. In the soft calendering process, the temperature becomes 100 ° C. to 200 ° C. in order to improve the smoothness and gloss of the coated paper, but the moisture of the coated paper is lost every time it passes through the nip. The surface of the coated paper that hits the metal roll surface at the first nip where the moisture content of the coated paper is the highest is easily plasticized, and the glossiness and smoothness of the blank paper are most likely to occur. Therefore, when there is at least one shoe press composed of felt-belt for dehydration, the felt of shoe press is inferior in smoothness even though the difference in coating amount is reduced by reducing the coating amount difference. It is necessary to apply the surface coated on the base paper surface in contact with the side (hereinafter referred to as “felt side coated surface or F”) to the metal roll.
次いで２ニップ目は、シュープレスのベルト側に接した原紙面に塗被した面（以下、「ベルト側塗被面又はＢ」という。）を金属ロールに当て、更に３ニップ目はベルト側塗被面を金属ロールに当て、４ニップ目にはフェルト側塗被面を金属ロール面に当てて、塗被紙表裏の均一化を図る必要がある。 Next, in the second nip, the surface (hereinafter referred to as “belt-side coated surface or B”) coated on the base paper surface in contact with the belt side of the shoe press is applied to a metal roll, and the third nip is further coated in the belt side. It is necessary to make the coated paper front and back uniform by applying the surface to the metal roll and applying the felt side coating surface to the metal roll surface at the fourth nip.
塗被紙水分との関係で、１ニップ目では最もソフトカレンダー処理による効果が高く、次いで２ニップ目、３ニップ目となるが、塗被紙の脱水が進むにつれて処理効果は順に少なくなると考えられる。４ニップ目では、処理効果が更に低い。 In relation to the moisture content of the coated paper, the effect of the soft calender process is the highest at the first nip, and then the second nip and the third nip, but the processing effect is considered to decrease in order as the dewatering of the coated paper proceeds. . At the fourth nip, the processing effect is even lower.
したがって、紙くせ、カールを防ぐために、金属ロールに当てる回数を塗被紙表裏共に同じくするためには、フェルト側塗被面、ベルト側塗被面、ベルト側塗被面、フェルト側塗被面の順が不可欠である。 Therefore, in order to prevent paper curling and curling, the same number of times of application to the metal roll on both the coated paper front and back, felt side coated surface, belt side coated surface, belt side coated surface, felt side coated surface The order is essential.
次に、本発明に係る塗被紙の製造方法を説明する。本実施形態に係る塗被紙の製造方法は、プレスパートに、脱水がフェルト−ベルトで構成されてなる少なくとも１基のシュープレスを持つ原紙抄紙部と、フィルムサイザーと、塗被部と、金属ロールと弾性ロールで組み合わされた一対のニップを持つソフトカレンダーが４基又は５基を通して塗被紙を処理する仕上げ部と、が一体となった１２００ｍ／分以上の塗被紙製造設備を用いる塗被紙の製造方法において、前記ソフトカレンダーを通す際に、最初の４ニップの金属ロール面に当たる塗被紙の面が、前記シュープレスのフェルト側に接した原紙面に塗被した面であるフェルト側塗被面側、シュープレスのベルト側に接した原紙面に塗被した面であるベルト側塗被面側、ベルト側塗被面側、フェルト側塗被面側の順になるように通紙する。 Next, the manufacturing method of the coated paper which concerns on this invention is demonstrated. The coated paper manufacturing method according to the present embodiment includes a base paper-making unit having at least one shoe press formed by a felt-belt in a press part, a film sizer, a coated unit, and a metal. Coating using a coated paper manufacturing facility of 1200 m / min or more, in which a soft calender having a pair of nips combined with a roll and an elastic roll processes a coated paper through four or five soft calendars. In the paper manufacturing method, the felt is a surface coated with the surface of the base paper that is in contact with the felt side of the shoe press when the surface of the coated paper hitting the metal roll surface of the first 4 nips is passed through the soft calender. Pass the paper so that the side coated surface side, the belt side coated surface side, which is the surface coated on the base paper surface in contact with the belt side of the shoe press, the belt side coated surface side, and the felt side coated surface side. Do
原紙抄造部であるワイヤーパート部には、オントップフォーマー、とりわけ高速抄造に適したギャップフォーマーが適している。坪量としては、３０ｇ〜８０ｇ／ｍ２である。酸性抄紙、中性抄紙、アルカリ抄紙のいずれで抄造されてもよい。また、メカニカルパルプを含む中質原紙又は古紙パルプを含む原紙若しくは上質原紙としてもよい。 An on-top former, especially a gap former suitable for high-speed papermaking, is suitable for the wire part which is a base paper papermaking section. The basis weight is 30 g to 80 g / m 2 . The paper may be made by any of acidic papermaking, neutral papermaking, and alkaline papermaking. Moreover, it is good also as a base paper or a quality base paper containing the medium quality base paper containing a mechanical pulp, a used paper pulp.
ワイヤーパート部での紙層は、次いでプレスパートに移行され、更に脱水される。本実施形態では、プレスパートは、脱水がフェルト−ベルトで構成されてなる少なくとも１基のシュープレスをもつ。高速に適したプレスパートは、通常、２基のシュープレスから成り立ち、１基目は湿紙をフェルト−フェルトで挟み込み、湿紙の両面から脱水させる。２基目は、フェルト−ベルトで挟み込み、湿紙の再湿潤を防ぎながら脱水させる。なお、フェルト−ベルトにすることによって、幅方向の水分プロファイルが安定する利点があり、広く採用されている。 The paper layer at the wire part is then transferred to the press part and further dewatered. In this embodiment, the press part has at least one shoe press in which dewatering is constituted by a felt-belt. A press part suitable for high speed usually comprises two shoe presses, and the first presses wet paper with felt-felt and dehydrates both sides of the wet paper. The second is sandwiched between felt-belts and dehydrated while preventing wet paper rewetting. The felt-belt has the advantage of stabilizing the moisture profile in the width direction and is widely used.
プレスパートで脱水された湿紙は、プレドライヤーパートに移行され、乾燥される。プレドライヤーパートは、通常オープンドローがないシングルデッキドライヤーを用いる。 The wet paper dehydrated in the press part is transferred to the pre-dryer part and dried. The pre-dryer part usually uses a single deck dryer without open draw.
プレドライヤー後、フィルムメタリングサイズプレスなどのフィルムサイザーで、澱粉などの水性接着剤を１３〜１８質量％濃度で、両面絶乾で１．０〜２．４ｇ／ｍ２、例えば２ｇ／ｍ２程度塗布し、アフタードライヤーにて乾燥して、原紙への表面平滑性の付与、内部結合強度の向上及びバリヤー性の向上を図る。 After pre-dryer, a film sizer such as a film metering size press, with 13 to 18% strength by weight aqueous adhesives such as starch, 1.0~2.4g / m 2 on both sides absolutely dry, for example 2 g / m 2 Apply to a certain degree and dry with an after dryer to give the base paper surface smoothness, improve internal bond strength, and improve barrier properties.
フィルムサイザーにおいて、接着剤を主成分とする固形分濃度が１３〜１８質量％、好ましくは１４〜１７質量％の水性液が塗布されることが本発明においては特に重要である。一般的に、フィルムサイザーによって澱粉などを主体とする接着剤の水性液を原紙に塗布し、原紙表面強度の向上及びに塗料の浸み込みの防止を図り、かつ、内部結合強度の向上によってオフ輪印刷時の耐ブリスター性の向上が図られている。そのためには、接着剤の固形分濃度を、通常１２質量％以下、好ましくは１０質量％以下とすることによって目的を十分果たせることができる。 In the film sizer, it is particularly important in the present invention that an aqueous liquid having a solid concentration of 13 to 18% by mass, preferably 14 to 17% by mass, mainly composed of an adhesive, is applied. In general, an aqueous solution of adhesive, mainly starch, is applied to the base paper with a film sizer to improve the base paper surface strength and prevent the paint from penetrating, and to improve the internal bond strength. Improvement of blister resistance at the time of circle printing is achieved. For that purpose, the purpose can be satisfactorily achieved by setting the solid content concentration of the adhesive to usually 12 mass% or less, preferably 10 mass% or less.
意外なことに、本発明のような１２００ｍ／分を超える高速オンマシン塗被においては、フィルムサイザーにおける接着剤濃度は、単に原紙表面強度や内部結合強度を上げるだけでなく、別の影響を与えることを本発明者らは見出した。すなわち、本発明者らは、ヒジワ又はコックリングと呼ばれる外観上の欠点に、接着剤の固形分濃度が深く関係することを見出した。その理由は明確ではないが、水性液を塗布するため、接着剤が所定濃度以下の場合には、水の浸み込みによる原紙の伸び及びその後の乾燥による縮みが発生し、塗被、ソフトカレンダー処理してもヒジワ、コックリングと呼ばれる外観上の波打ちが発生するものと推定される。なお、本発明で使用する塗被紙製造設備は、抄造速度１２００ｍ／分以上、例えば、１２００〜１８００ｍ／分の設備を想定している。ここで、上限の１８００ｍ／分は例示であり、本発明を限定するものではない。 Surprisingly, in high-speed on-machine coating exceeding 1200 m / min as in the present invention, the adhesive concentration in the film sizer not only increases the surface strength of the base paper and the internal bond strength, but also has another effect. The present inventors have found that. That is, the present inventors have found that the solid content concentration of the adhesive is deeply related to the appearance defect called Hijiwa or cockling. The reason for this is not clear, but since an aqueous liquid is applied, if the adhesive is below a predetermined concentration, the base paper will stretch due to water soaking and shrinkage due to subsequent drying. Even if it is processed, it is presumed that undulations on the appearance called “hijiwa” and “cockling” occur. In addition, the coated paper manufacturing equipment used by this invention assumes the papermaking speed | rate 1200 m / min or more, for example, the equipment of 1200-1800 m / min. Here, the upper limit of 1800 m / min is an exemplification, and does not limit the present invention.
澱粉などの接着剤の塗布量は、所望の表面強度及び内部結合強度で変わるが、１．０〜２．４ｇ／ｍ２、一般的には両面絶乾で２ｇ／ｍ２・前後である。 The coating amount of an adhesive such as starch varies depending on the desired surface strength and internal bond strength, but is 1.0 to 2.4 g / m 2 , and generally 2 g / m 2 · around double-side dry.
原紙への水の浸み込みを軽減するためには、接着剤を所望塗布量つけるに際して、高濃度にすることによって、水の持ち込みを抑えることができるし、また、高濃度にするにつれて水性液粘度が上昇し、原紙への水分移行を少なくすることができる。接着剤濃度が１３質量％未満の場合は、粘度も低く、水の持ち込み量が多いので、原紙の伸び及びその後の乾燥による縮みが発生し、塗被、ソフトカレンダー処理してもヒジワ又はコックリングと呼ばれる外観上の波打ちが発生する場合がある。一方、接着剤濃度が１８％を超えると外観上の波打ちは発生しないものの、所望塗布量に制御することが困難であり、塗布量が多く付きすぎるときは、塗被紙の透気抵抗度（ガーレー）（ＪＩＳ Ｐ ８１１７：１９９８）が急激に高くなり、耐ブリスター性は悪化してしまう場合がある。 In order to reduce the permeation of water into the base paper, it is possible to suppress the carry-in of water by increasing the concentration when applying the desired amount of adhesive. Viscosity increases, and moisture transfer to the base paper can be reduced. When the adhesive concentration is less than 13% by mass, the viscosity is low and the amount of water brought in is large. Therefore, the base paper stretches and shrinks due to subsequent drying. In some cases, the appearance of undulations may occur. On the other hand, if the adhesive concentration exceeds 18%, the undulation on the appearance does not occur, but it is difficult to control to the desired application amount, and when the application amount is too much, the air resistance of the coated paper ( Gurley) (JIS P 8117: 1998) increases rapidly, and the blister resistance may deteriorate.
澱粉などの接着剤としては、熱化学変性用のアセチルタピオカ澱粉、熱化学変性用のコーン澱粉、酸化澱粉、尿素燐酸エステル化澱粉などが適している。 As an adhesive such as starch, acetyl tapioca starch for thermochemical modification, corn starch for thermochemical modification, oxidized starch, urea phosphated starch and the like are suitable.
なお、澱粉などの水性接着剤を１３〜１８質量％濃度で塗布する代わりに、水性接着剤とクレー、炭酸カルシウム等のピグメントとを１：２〜１．２：１、例えば１：１の質量比で混ぜ合わせたピグメントサイズと呼ばれる塗布液を濃度３０質量％以上、好ましくは３２〜４０質量％で塗布しても同様な効果が期待できる。 In addition, instead of applying an aqueous adhesive such as starch at a concentration of 13 to 18% by mass, the aqueous adhesive and pigment such as clay and calcium carbonate have a mass of 1: 2 to 1.2: 1, for example, 1: 1. The same effect can be expected even when a coating solution called pigment size mixed at a ratio is applied at a concentration of 30% by mass or more, preferably 32 to 40% by mass.
その後に、ブレードコータによる塗被部（コーターパート）で、片面ずつ塗液が塗被され、赤外ドライヤー、エアードライヤー、シリンダードライヤーなどの乾燥機を用いて乾燥する。塗被量は、両面絶乾で１２〜３０ｇ／ｍ２が好ましい。 Thereafter, the coating liquid is coated on one side at a coating portion (coater part) by a blade coater, and dried using a dryer such as an infrared dryer, an air dryer, or a cylinder dryer. The coating amount is preferably 12 to 30 g / m 2 by double-sided dryness.
ブレードコータで塗被される塗料は、顔料、接着剤、助剤などから構成される。 The paint applied by the blade coater is composed of pigments, adhesives, auxiliaries and the like.
顔料は、重質炭酸カルシウム、軽質炭酸カルシウム、カオリンクレー、デラミクレー、二酸化チタンなどの無機顔料、密実タイプや中空タイプのプラスチックピグメントなどの有機顔料を用いることができ、必要に応じて２種類以上混合して使用する。 As the pigment, inorganic pigments such as heavy calcium carbonate, light calcium carbonate, kaolin clay, delamy clay, and titanium dioxide, and organic pigments such as solid type and hollow type plastic pigments can be used. Use by mixing.
接着剤は、ラテックス、酸化澱粉、尿素燐酸エステル化澱粉、ヒドロキシエチルエーテル化澱粉、カゼイン、大豆蛋白、カルボキシメチルセルロース、ヒドロキシエチルセルロースなどが用いられる。 As the adhesive, latex, oxidized starch, urea phosphate esterified starch, hydroxyethyl etherified starch, casein, soy protein, carboxymethylcellulose, hydroxyethylcellulose and the like are used.
助剤には、分散剤、消泡剤、保水剤、増粘剤、耐水化剤、青味顔料、染料、蛍光染料などが用いられる。 As the auxiliary agent, a dispersant, an antifoaming agent, a water retention agent, a thickening agent, a water resistant agent, a bluish pigment, a dye, a fluorescent dye, and the like are used.
このようにして塗被、乾燥された塗被紙は、１００℃以上の高温、線圧１００ｋＮ／ｍ以上、好ましくは１５０〜３００ｋＮ／ｍのソフトカレンダー処理によって光沢、平滑付けの仕上げが施される。 The coated paper thus coated and dried is given a glossy and smooth finish by a soft calendering process at a high temperature of 100 ° C. or higher and a linear pressure of 100 kN / m or higher, preferably 150 to 300 kN / m. .
ソフトカレンダーは、金属ロールと樹脂ロールが一対のニップを形成し、４基から５基設置されて４ニップから５ニップで塗被面を処理する。金属ロールは、オイルなどの熱媒体を内部に流通させて８０℃〜２３０℃程度まで加熱される。本発明においては、最初の４ニップの金属ロール面に当たる塗被紙の面が、フェルト側塗被面側、ベルト側塗被面側、ベルト側塗被面側、フェルト側塗被面側の順になるように通紙する。 In the soft calender, a metal roll and a resin roll form a pair of nips, 4 to 5 units are installed, and the coated surface is processed by 4 to 5 nips. The metal roll is heated to about 80 ° C. to 230 ° C. by circulating a heat medium such as oil inside. In the present invention, the surface of the coated paper that hits the first 4-nip metal roll surface is in the order of the felt side coated surface side, the belt side coated surface side, the belt side coated surface side, and the felt side coated surface side. Pass through the paper.
ソフトカレンダーを５基設置している場合は、最後の５ニップ目はベルト側、フェルト側のどちら塗被紙の面を金属面にあてても構わない。 When five soft calenders are installed, the surface of the coated paper on the belt side or felt side may be applied to the metal surface at the final fifth nip.
次に実施例を挙げて本発明を具体的に示す。なお、各実施例はテストプラントによるテスト例であることを付記する。 Next, an Example is given and this invention is shown concretely. It should be noted that each example is a test example by a test plant.
塗被紙の品質評価は次の方法による。
１．白紙光沢
ＪＩＳ Ｐ ８１４２：２００５「紙及び板紙‐７５度鏡面光沢度の測定方法」に準拠して測定した。
２．平滑度
ＪＩＳ Ｐ ８１１９：１９９８「紙及び板紙‐ベック平滑度試験機による平滑度試験方法」に準拠して測定した。
３．外観評価（波打ち評価）
ソフトカレンダー処理後の巻き取りから３０ｃｍ×６０ｃｍのサンプルを切り出し、２４時間室温で放置し、表面の外観を目視評価した。
ヒジワ・コックリングなどの波打ちがないもの ○
ヒジワ・コックリングなどの波打ちを若干感じるもの（実用上下限） △
ヒジワ・コックリングなどの波打ちが目立つもの（実用に耐えない） ×
４．オフ輪印刷のブリスター評価
三菱重工社製オフセット輪転機リソピア（ＢＴ ２Ｌ−８００ＮＥＯ） 印刷速度：６００ｒｐｍ
紙面温度１４０℃でブリスターを発生しないもの ○
紙面温度１４０℃でブリスターを発生するもの（実用に耐えない） ×
The quality of coated paper is evaluated by the following method.
1. White paper gloss Measured according to JIS P 8142: 2005 "Paper and paperboard-Method for measuring 75 degree specular gloss".
2. Smoothness Measured according to JIS P 8119: 1998 “Paper and paperboard—Smoothness test method using Beck smoothness tester”.
3. Appearance evaluation (waved evaluation)
A sample of 30 cm × 60 cm was cut out from the winding after the soft calendering treatment and left at room temperature for 24 hours, and the appearance of the surface was visually evaluated.
No waves such as Hijiwa cock ring ○
Something that feels undulations such as Hijiwa cock ring (practical upper and lower limits) △
Conspicuous waviness such as Hijiwa cock ring (not practical) ×
4). Blister evaluation of off-wheel printing MHI offset web offset press lithopier (BT 2L-800NEO) Printing speed: 600 rpm
No blisters at a paper surface temperature of 140 ° C ○
Those that generate blisters at a paper surface temperature of 140 ° C (not practical) ×
（実施例１）
原紙抄造のための紙料は、叩解度としてカナダ標準フリーネス（ＣＳＦ）６００ｍｌの針葉樹（Ｎ）パルプ２０質量％と叩解度としてＣＳＦ４５０ｍｌの広葉樹（Ｌ）パルプ８０質量％の配合に、市販カチオン澱粉 ネオタック３０Ｔ（日本食品加工株式会社製）を０．２重量％添加し、軽質炭酸カルシウム ＴＰ１２１（奥多摩工業株式会社製）を填料率が８質量％となるように、市販カチオン系ポリアクリルアミド歩留まり向上剤 パーコール２９２（アライドコロイド社製）を０．０３質量％添加した。原紙は、ワイヤーパート部がメッツオペーパー社製ギャップフォーマー、プレスパート部がメッツオ社タンデム型シュープレスを用いて、１基目がフェルト−フェルトでのプレス脱水、２基目がフェルト−ベルトでの脱水後、オープンドローがないシングルデッキドライヤーによって乾燥させて得られた。得られた原紙の坪量は、４５ｇ／ｍ２であった。ついで、メッツオペーパー社製オプチサイザーを用いたメタリングサイズプレス装置によって、熱化学変性用アセチルタピオカ澱粉 ＭＳ５３００（日本食品加工株式会社製）を定法によって蒸煮後、１４質量％の固形分濃度で、両面絶乾で２ｇ／ｍ２塗布し、乾燥した。その後、ブレードコータによって両面で２３ｇ／ｍ２になるよう塗料を塗被、乾燥した。塗料は、顔料としてアマゾン８８（カダム社製）３０質量部及び湿式重カル カービタル９０（イメリス社製）７０質量部を用い、接着剤として、尿素燐酸エステル化澱粉 ＭＳ４６００（日本食品加工株式会社製）を１質量部、ラテックスとしてＪＳＲ株式会社製 ２７８８Ｇ を１０質量部用い、塗料固形分は６５％であった。なお、原紙抄造から塗被・乾燥までの工程を、すべて１６００ｍ／分の抄造速度にて実施した。塗被紙の仕上げは、メッツオペーパー社製ソフトカレンダー オプチソフトを用い、金属ロール温度１３０℃、ニップ線圧３００ｋＮ／ｍで４ニップ通過とした。金属ロールに当たる順番は、フェルト側塗被面−ベルト側塗被面−ベルト側塗被面−フェルト側塗被面であった。ソフトカレンダー処理速度は、本生産工程と同様の１６００ｍ／分に該当するよう設定した。以上によって、実施例１の塗被紙を得た。
(Example 1)
The raw material for papermaking is a blend of 20% by mass of Canadian standard freeness (CSF) 600 ml of softwood (N) pulp with a beating degree and 80% by mass of hardwood (L) pulp with a beating degree of CSF of 450 ml. Commercially available cationic polyacrylamide yield improver Percoll so that 0.2% by weight of 30T (manufactured by Japan Food Processing Co., Ltd.) and light calcium carbonate TP121 (manufactured by Okutama Kogyo Co., Ltd.) can be 8% by mass. 292 (made by Allied Colloid) was added in an amount of 0.03% by mass. The base paper is a gap former made by Metso Paper Co., Ltd., the press part is Metso tandem shoe press, the first is felt-felt press dewatering, the second is felt-belt. After dehydration, it was obtained by drying with a single deck dryer without open draw. The basis weight of the obtained base paper was 45 g / m 2 . Then, after a steaming of acetyl tapioca starch for thermochemical modification MS5300 (manufactured by Nippon Food Processing Co., Ltd.) with a metering size press using a Metso Paper Opticizer, a solid content concentration of 14% by mass, 2 g / m 2 was applied by double-sided dry and dried. Thereafter, the coating material was applied and dried at 23 g / m 2 on both sides with a blade coater. The paint uses 30 parts by weight of Amazon 88 (manufactured by Caddam) and 70 parts by weight of wet heavy carbital 90 (manufactured by Imeris) as a pigment, and urea phosphate esterified starch MS4600 (manufactured by Nippon Food Processing Co., Ltd.) as an adhesive. Was 1 part by weight, 10 parts by weight of 2788G manufactured by JSR Corporation was used as latex, and the solid content of the paint was 65%. The steps from base paper making to coating / drying were all carried out at a paper making speed of 1600 m / min. The coated paper was finished using Metso Paper Co., Ltd. soft calender optosoft, and passed through 4 nips at a metal roll temperature of 130 ° C. and a nip linear pressure of 300 kN / m. The order of hitting the metal rolls was felt side coated surface−belt side coated surface−belt side coated surface−felt side coated surface. The soft calendar processing speed was set to correspond to 1600 m / min, which is the same as in the production process. The coated paper of Example 1 was obtained by the above.
（実施例２）
ソフトカレンダーの金属ロール温度を１８０℃、ニップ線圧３５０ｋＮ／ｍとした以外は実施例１と同様にして、実施例２の塗被紙を得た。
(Example 2)
A coated paper of Example 2 was obtained in the same manner as in Example 1 except that the metal roll temperature of the soft calender was 180 ° C. and the nip linear pressure was 350 kN / m.
（実施例３）
サイズ液を尿素燐酸エステル化澱粉 ＭＳ４６００（日本食品加工株式会社製）を定法によって蒸煮後、濃度１７質量％にて塗布した以外は実施例１と同様にして、実施例３の塗被紙を得た。
(Example 3)
A coated paper of Example 3 was obtained in the same manner as in Example 1 except that urea phosphate esterified starch MS4600 (manufactured by Nippon Food Processing Co., Ltd.) was steamed by a conventional method and applied at a concentration of 17% by mass. It was.
（実施例４）
実施例１において熱化学変性用アセチルタピオカ澱粉ＭＳ５３００の１４質量％の水性接着剤を塗布する代わりに、尿素燐酸エステル化澱粉 ＭＳ４６００（日本食品加工株式会社製）と、クレー及び炭酸カルシウムのピグメントとを１：１の質量比で混ぜ合わせた濃度３５質量％のピグメントサイズ（塗布液）を塗布した以外は実施例１と同様にして、実施例４の塗被紙を得た。ピグメントサイズの塗布量は両面絶乾で２．４ｇ／ｍ２とした。
Example 4
Instead of applying 14% by mass aqueous adhesive of acetyl tapioca starch MS5300 for thermochemical modification in Example 1, urea phosphated starch MS4600 (manufactured by Nippon Food Processing Co., Ltd.), and clay and calcium carbonate pigments were used. A coated paper of Example 4 was obtained in the same manner as in Example 1 except that a pigment size (coating solution) having a concentration of 35% by mass mixed at a mass ratio of 1: 1 was applied. The application amount of the pigment size was 2.4 g / m 2 by double-drying on both sides.
（比較例１）
ソフトカレンダー処理時に金属ロールに当たる順番を、ベルト側塗被面−フェルト側塗被面−フェルト側塗被面−ベルト側塗被面とした以外は実施例１と同様にして、比較例１の塗被紙を得た。
(Comparative Example 1)
The coating of Comparative Example 1 was performed in the same manner as in Example 1 except that the order of contact with the metal roll during the soft calender treatment was belt side coated surface-felt side coated surface-felt side coated surface-belt side coated surface. A paper was obtained.
（比較例２）
ソフトカレンダー処理時に金属ロールに当たる順番を、フェルト側塗被面−ベルト側塗被面−フェルト側塗被面−ベルト側塗被面とした以外は実施例１と同様にして、比較例２の塗被紙を得た。
(Comparative Example 2)
The coating of Comparative Example 2 was performed in the same manner as in Example 1 except that the order of contact with the metal roll during the soft calender treatment was felt side coated surface-belt side coated surface-felt side coated surface-belt side coated surface. A paper was obtained.
（比較例３）
ソフトカレンダー処理時に金属ロールに当たる順番を、ベルト側塗被面−フェルト側塗被面−フェルト側塗被面−ベルト側塗被面とし、メタリングサイズプレス装置で、熱化学変性用アセチルタピオカ澱粉 ＭＳ５３００（日本食品加工株式会社製）を定法によって蒸煮後、１０質量％の固形分濃度で、両面絶乾で２ｇ／ｍ２・塗布・乾燥した以外は実施例１と同様にして、比較例３の塗被紙を得た。
(Comparative Example 3)
Acetal tapioca starch MS5300 for thermochemical modification with a metalling size press machine in the order of contact with the metal roll during the soft calender treatment, belt side coated surface-felt side coated surface-felt side coated surface-belt side coated surface. Comparative Example 3 was prepared in the same manner as in Example 1 except that it was cooked by a conventional method (manufactured by Nippon Food Processing Co., Ltd.) and solid-coated at a concentration of 10% by weight, 2 g / m 2 . Coated paper was obtained.
（比較例４）
ソフトカレンダー処理時に金属ロールに当たる順番を、ベルト側塗被面−フェルト側塗被面−フェルト側塗被面−ベルト側塗被面とし、メタリングサイズプレス装置で、尿素燐酸エステル化澱粉 ＭＳ４６００（日本食品加工株式会社製）を定法によって蒸煮後、２２質量％の固形分濃度で、両面絶乾で２．８ｇ／ｍ２・塗布・乾燥した以外は実施例１と同様にして、比較例４の塗被紙を得た。
(Comparative Example 4)
The order of hitting the metal roll during the soft calender treatment is belt side coated surface-felt side coated surface-felt side coated surface-belt side coated surface, and urea phosphate esterified starch MS4600 (Japan) Food Processing Co., Ltd.) was cooked by a conventional method, and then, in the same manner as in Example 1, except that the solid content concentration was 22% by mass, and 2.8 g / m 2 was applied and dried on both sides. Coated paper was obtained.
（比較例５）
ソフトカレンダー処理時に金属ロールに当たる順番を、ベルト側塗被面−フェルト側塗被面−フェルト側塗被面−ベルト側塗被面とした以外は実施例４と同様にして、比較例５の塗被紙を得た。
(Comparative Example 5)
The coating of Comparative Example 5 was performed in the same manner as in Example 4 except that the order of contact with the metal roll during the soft calender treatment was belt side coated surface-felt side coated surface-felt side coated surface-belt side coated surface. A paper was obtained.
以上の結果を表１に示した。
表１から明らかなように、実施例１〜４は白紙光沢、平滑度ともに表裏差が少なく、外観も優れている。一方、比較例１は、金属ロールに当たる塗被面をＢ，Ｆ，Ｆ，Ｂの順としたので、表裏差が大きかった。比較例２は、金属ロールに当たる塗被面をＦ，Ｂ，Ｆ，Ｂの順としたので、表裏差が大きかった。比較例３は、金属ロールに当たる塗被面をＢ，Ｆ，Ｆ，Ｂの順とし、かつ、サイズ液の固形分濃度が１０質量％と低いため、表裏差が大きく、かつ、塗被紙の外観がコックリング状になり、劣る。比較例４は、金属ロールに当たる塗被面をＢ，Ｆ，Ｆ，Ｂの順とし、かつ、サイズ液の固形分濃度が２２質量％と高いため、表裏差が大きく、かつ、澱粉の塗布量が制御しづらく、塗布量が多いためにオフ輪印刷でのブリスターが発生した。実施例４はピグメントサイズを塗布したが、実施例１と同様に白紙光沢、平滑度ともに表裏差が少なく、外観も優れていた。ただし、金属ロールに当たる塗被面をＢ，Ｆ，Ｆ，Ｂの順とした以外は実施例４と同様にして得られた比較例５は、白紙光沢と平滑度の表裏差が大きかった。 As is clear from Table 1, Examples 1 to 4 have little difference between the front and back sides of both white paper gloss and smoothness, and are excellent in appearance. On the other hand, in Comparative Example 1, since the coating surface that hits the metal roll was in the order of B, F, F, and B, the difference between the front and the back was large. In Comparative Example 2, since the coating surface that hits the metal roll was in the order of F, B, F, and B, the front-back difference was large. In Comparative Example 3, the coating surface that hits the metal roll is in the order of B, F, F, and B, and the solid content concentration of the sizing liquid is as low as 10% by mass. Appearance becomes cockling and inferior. In Comparative Example 4, the coating surface that hits the metal roll is in the order of B, F, F, and B, and the solid content concentration of the size liquid is as high as 22% by mass. Is difficult to control, and because of the large amount of coating, blisters occurred in off-ring printing. In Example 4, the pigment size was applied, but as in Example 1, both the glossiness and smoothness of the white paper were small and the appearance was excellent. However, Comparative Example 5 obtained in the same manner as in Example 4 except that the coating surface corresponding to the metal roll was in the order of B, F, F, and B had a large difference between the front and back of blank paper gloss and smoothness.
Claims (3)
前記ソフトカレンダーを通す際に、最初の４ニップの金属ロール面に当たる塗被紙の面が、前記シュープレスのフェルト側に接した原紙面に塗被した面であるフェルト側塗被面側、シュープレスのベルト側に接した原紙面に塗被した面であるベルト側塗被面側、ベルト側塗被面側、フェルト側塗被面側の順になるように通紙することを特徴とする塗被紙の製造方法。 The press part has a base paper making part having at least one shoe press made of felt-belt dewatering, a film sizer, a coating part, and a pair of nips combined with a metal roll and an elastic roll. In a coated paper manufacturing method using a coated paper manufacturing facility of 1200 m / min or more in which a finishing unit that processes coated paper through four or five soft calenders is integrated.
When passing through the soft calender, the surface of the coated paper that contacts the metal roll surface of the first four nips is the surface coated on the surface of the base paper in contact with the felt side of the shoe press. The coating is characterized in that the paper is passed in the order of the belt side coating surface side, the belt side coating surface side, and the felt side coating surface side, which are the surfaces coated on the base paper surface in contact with the belt side of the press. A method for producing paper.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2010229583A (en) * | 2009-03-26 | 2010-10-14 | Hokuetsu Kishu Paper Co Ltd | Coated paper for printing |
| JP2011058148A (en) * | 2009-09-14 | 2011-03-24 | Hokuetsu Kishu Paper Co Ltd | Method for coated paper for both offset/gravure printing |
| JP2014189924A (en) * | 2013-03-27 | 2014-10-06 | Hokuetsu Kishu Paper Co Ltd | Coated paper for printing |
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| JPH111891A (en) * | 1997-06-11 | 1999-01-06 | Nippon Paper Ind Co Ltd | Production of coated paper and coated paper |
| JP2004143612A (en) * | 2002-10-23 | 2004-05-20 | Mitsubishi Paper Mills Ltd | Paper preventing curl and method for producing the same |
| JP2006193842A (en) * | 2005-01-11 | 2006-07-27 | Daio Paper Corp | Method for producing coated paper and installation for producing the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03256957A (en) * | 1990-03-02 | 1991-11-15 | Kuwaki Tekkosho:Kk | Air flowing direction reverser and air chuck device |
| JPH111891A (en) * | 1997-06-11 | 1999-01-06 | Nippon Paper Ind Co Ltd | Production of coated paper and coated paper |
| JP2004143612A (en) * | 2002-10-23 | 2004-05-20 | Mitsubishi Paper Mills Ltd | Paper preventing curl and method for producing the same |
| JP2006193842A (en) * | 2005-01-11 | 2006-07-27 | Daio Paper Corp | Method for producing coated paper and installation for producing the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2010229583A (en) * | 2009-03-26 | 2010-10-14 | Hokuetsu Kishu Paper Co Ltd | Coated paper for printing |
| JP2011058148A (en) * | 2009-09-14 | 2011-03-24 | Hokuetsu Kishu Paper Co Ltd | Method for coated paper for both offset/gravure printing |
| JP2014189924A (en) * | 2013-03-27 | 2014-10-06 | Hokuetsu Kishu Paper Co Ltd | Coated paper for printing |
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